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Re: One third vs. One-third

The spelling with the hyphen is the correct one according to the dictionaries I've checked. However you will find plenty versions without the "-" if you google it, but that doesn't mean it is correct.

From Wikipedia:

Fractions as modifiers are hyphenated: "five-eighths inches", but if numerator or denominator are already hyphenated, the fraction itself does not take a hyphen: "a thirty-three thousandth part". (Fractions used as nouns have no hyphens: "I ate only one third of the pie.")